linux-kernel - Re: [PATCH mm-unstable 8/8] mm/hugetlb: convert demote_free_huge

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Date:   Sat, 7 Jan 2023 01:31:00 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, songmuchun@...edance.com,
        tsahu@...ux.ibm.com, jhubbard@...dia.com
Subject: Re: [PATCH mm-unstable 8/8] mm/hugetlb: convert
 demote_free_huge_page to folios

On Fri, Jan 06, 2023 at 05:11:36PM -0800, Mike Kravetz wrote:
> On 01/03/23 13:13, Sidhartha Kumar wrote:
> > @@ -3477,15 +3477,15 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
> >  	mutex_lock(&target_hstate->resize_lock);
> >  	for (i = 0; i < pages_per_huge_page(h);
> >  				i += pages_per_huge_page(target_hstate)) {
> > -		subpage = nth_page(page, i);
> > -		folio = page_folio(subpage);
> > +		subpage = folio_page(folio, i);
> > +		subfolio = page_folio(subpage);
> 
> No problems with the code, but I am not in love with the name subfolio.
> I know it is patterned after 'subpage'.  For better or worse, the term
> subpage is used throughout the kernel.  This would be the first usage of
> the term 'subfolio'.
> 
> Matthew do you have any comments on the naming?  It is local to hugetlb,
> but I would hate to see use of the term subfolio based on its introduction
> here.

I'm really not a fan of it either.  I intended to dive into this patch
and understand the function it's modifying, in the hopes of suggesting
a better name and/or method.

Since I haven't done that yet, maybe "new" or "dest" names work?